Locomotive-boiler with smoke-tube superheater.



P. THOMSEN & BDOETTLOFF. LOGOMOTIVB BOILER WITH SMOKE TUBE SUPBRHEATBR.

APPLICATION PLD 11111.19, 1911.

Patented 119111511914.

N .T m a 5 P. THOMSEN; BDOETTLGFF. LOCOMOTIVE BOILER WITH SMOKE TUBE SUPERHEATER. '\PPLTCATION PILED JAN.19,1911.

1,120,764, vPatented Dec. 15, 1914.

SHEETS-SHEET 2.

i l' I P. THOMSEN & JE.DOBTTLOFF.- LOQOMOTIVB BOILBR WITHSMOKE TUBE SUPBRHEATER. APPLICATION FILED JAN.19, 1911.

1, l 20,764. Patented Deo. 1.5, 1914,

3 SHEETS-SHEET 3 y I l fija. mn/r9 rrnn 'rares rarnurl orales.

vPIE'IIEB THOMSEN AND EGMONT DOETTLOFF, 0F CASSEL, GERMANY, ASSIGNOB'S T0 `SGHuzIlDIE"SGHIE HEISSDAMPF-GESELLSCHAFT `IMI'L BESCHENKTER HAFTUNG, OF

LOCGMTIVE-BOILER WITH SMOKE-TUBE SUPEBEEATER.

Speqication of Letters Patent.

' Patented Dee. 15, 19.14.

Application filed January 19, 1911. Serial No. 603,494.

useful Improvements in Locomotive-Boilers with Smoke-Tube Superheaters, or whichl the following is a speeication.

Our invention relates to superlieatcrs of the class in which superheater tubes are arranged in the smoke tubes (tire tubes) through which the furnace gases are carried. Generally these superheater tubes have been placed in special smoke tubes of greater diameter than the remaining smoke tubes,

` thereby bringing about av cutting down the 'heating surface of the boiler-,since the maximum heating surface is obtained with a maximum number of smoke tubes each of minimum. diameter. Large diametered smoke tubes also are necessarily so heavy as tc be relatively inelastic and hence they exercise -a pounding eect upon the tube sheets in which they are ixed, that greatly lessens the life of boiler. Expansion and contraction, also, make it much more dicult to maintain tight joints between the smoke tubes and the tube sheets into'which said tubesare lein panded where the ltubes are of large diameter rather than of small diameter.

ln a patent application, Serial 558,112,

filed April 28, 1910, madeby one of us as a joint inventor, there has been described a locomotive superheater construuctlon 1n which superheater tubes are placedin thenormal diametered and regular smoke tubes of the usual locomotive boiler. Such a construction offers manifest advantages in connection With'old non-superheater locomotives inasmuch as such locomotives may thereby readily be equipped with a superheater without reconstructionof the entire boiler. The

' application just lreferred to disclosed an arrangement of the` ends of the superheater oops as they `lead to the steam headers such f s to enable,individual superheater elements l (or groups) to be conveniently inserted and removed also to nei-mit the use of convenin locomotive boilers.

.be readily and quickly traced and the joints quickly locatedQin case of leakage or for other purposeslfurther object; of the invention referred to vwas to prvideny` grouping of superheater loops and an arrangement of theirends so that the ends of the smoke tubes, as they join the tube sheet of the smoke box, where fairly free from obstruction and open-to inspection.

The object of the present invention is to attain the above enumerated ends in a novel manner as also to attain certain other advantages which will appear as thevspeciication proceeds. A

Referring to the. drawings accompanying, Figure l represents diagrammatically a front elevation of a locomotive boiler provided with normal diametercd smoke tubes the adjacent tubes being arranged in vertical rows; Fig. 2 is similar to Fig. 1, vbut with l adjacent tubes arranged in horizontal rows; Fig. 3 is an enlarged central vertical section of a locomotive boiler with horizontal rows of smoke tubes embodying our invention; Fig.v 4 is a transverse section taken along the line 4.-4 of Fig. 3; Fig. 5 is a. horizontal section taken along the line 5-f-5 of Fig.r3; Fig. 6 is a partial section similar to FigjB showing a modiication of our invention; Fig. 'Z is a. transverse section taken along the line 7-7 of Fig. 6; and Fig. 8 is a horizontal section taken along the line 8-8 of Fig. 6.-

The arrangement of smoke tubes in vertical rows as shown in Fig. 1 is the usual one By arranging said tubes in horizontal rows as shown in FigQ, the distance between central planes of said rows becomes about 70% greaterthanthe distance between centralplanes of adjacent horizontal rows as in Fig. 1. This increased distance between horizontal rows enables us to provide the very advantageous features the unit ends ).u'ojectillg from n, given row set our hands in the presence of two subof Smoke tubes being bent into a Asingle seribng witnesses. plane. nud l'mt the plaueof the smoke tube row, and ,u laterally disposed sturm heater PETER THOMSBJN. EGMONT DOETTLOFF. a :wmngg'ed pelfpendcularly to the .plaines o W'tnesses:

lthe Unit ends and of the smoke tube rows. CARL MOLL,

In testimony whereof, we have .hereunto ALFRED ARTIN. 

